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Junior Class 1 Answered

What is the sum of the first 5 multiples of3
Asked by Kaushik | 01 Feb, 2017, 06:00: PM
answered-by-expert Expert Answer

begin mathsize 16px style F i r s t space f i v e space m u l t i p l e s space o f space 3 space a r e space 3 comma space 6 comma space 9 comma space 12 comma space 15
H e r e comma space a equals 3 comma space d equals 3 comma space n equals 5 comma space l equals 15
S subscript n equals n over 2 left parenthesis a plus l right parenthesis equals 5 over 2 left parenthesis 3 plus 15 right parenthesis equals 5 over 2 cross times 18 equals 5 cross times 9 equals 45 end style

Answered by | 01 Feb, 2017, 06:05: PM
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