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Ask CBSE Class 10 question free ×

Queries asked on Sunday and after 7 pm from Monday to Saturday will be answered after 12 pm the next working day.

# CBSE Class 10 Free Doubts and Solutions

## A thief away from a police station with a uniform speed 100m/min. After 1 min a policeman runs behind the thief to catch him. He goes at a speed of 100m/min in 1st min and increases the speed 10m/min on each succeeding min. After how many minutes the policeman catches the thief.

Asked by Kumarashish6345 21st February 2019, 6:22 AM

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## If -5 is a zero of quadratic equation 2xsquare+px-15=0 and the quadratic equation p(xsquare+x)k=0 has equal roots, find the value of k

Asked by mssagarlm10 21st February 2019, 5:25 AM

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## prove that + is an irrational.

Asked by poshi.mails 20th February 2019, 10:33 PM

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## Prove that + is an irrational

Asked by poshi.mails 20th February 2019, 10:30 PM

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## mam/sir, I uploaded one photo in which I made my own formula to find the number of covalent bonds in a hydrocarbon so will you tell me that it really works or not?

Asked by krishdabhoya2003 20th February 2019, 9:32 PM

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## Let a1 , a2 , ........... , an , an+1 , ....... be an A.P. Let  S1 = a1 + a2 + a3 + ............. + an  S2 = an+1 + an+2 + ...............+ a2n  S3 = a2n+1 + a2n+2 + .............+ a3n ................................................ ................................................ Prove that the sequence S1 , S2 , S3 , ........ is an arithmetic progression whose common difference is n2 times the common difference of the given progression

Asked by rushabhjain.a 20th February 2019, 9:07 PM

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## The fourth power of the common difference of an arithmetic progression with integer entries added to the product of any four consecutive terms of it . Prove that the resulting sum is the square of an integer

Asked by rushabhjain.a 20th February 2019, 9:05 PM

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## If the sum of m terms of an AP is equal to the sum of either the next n terms or the next p terms of the same AP prove that (m+ n) [(1/m)-(1/p)] = (m + p) [(1/m) -(1/n)] .

Asked by rushabhjain.avv 20th February 2019, 9:02 PM

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## In an AP of which ‘a’ is the Ist term, if the sum of the Ist p terms is equal to zero , show that the sum of the next q terms is -a (p+ q) q/(p-1).

Asked by rushabhjain.avv 20th February 2019, 8:57 PM

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## The first and last terms of an A.P. are a and b. There are altogether (2n + 1) terms. A new series is formed by multiplying each of the first 2n terms by the next term. Show that the sum of the new series is (4n2-1)(a2+b2 )(4n2+2)ab/6n.

Asked by rushabhjain.avv 20th February 2019, 8:55 PM