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CBSE Class 11-science Answered

7+11+15+19....UpTo 20 terms.
Asked by Vipul009sharma | 13 Jan, 2019, 12:14: AM
answered-by-expert Expert Answer

AP

S20=20/2{2*7+(20-1)4}

=10{14+76}

=10×90

=900

Answered by Arun | 13 Jan, 2019, 01:20: AM
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CBSE 11-science - Maths
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Asked by Kchawla94 | 03 Mar, 2019, 09:20: PM
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CBSE 11-science - Maths
7+11+15+19....UpTo 20 terms.
Asked by Vipul009sharma | 13 Jan, 2019, 12:14: AM
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CBSE 11-science - Maths
Q;if a1,a2,a3....an are positive numbers in a.p. then show that 1/root(a1)+root(a2) +1/root(a2)+root(a3) + 1/root(a3)+root(a4).....+ 1/root(an)+root(an+1)= n/root(a1)+root(an+1)
Asked by | 14 Mar, 2012, 08:42: PM
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CBSE 11-science - Maths
IOF A,B,C ARE IN A.P. AND 1/B,1/C,1/D ARE IN A.P PROVE THAT AD=BC
Asked by | 13 Mar, 2012, 10:20: PM
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CBSE 11-science - Maths
Q:divide 20 into four parts which are in A.P. and such that the product first and fourth is to the product of second and third are in the ratio 2:3?
Asked by | 13 Mar, 2012, 10:05: PM
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