Math, asked by sLyTh, 6 months ago

If for an A.P. a=10 d=3 then find S=15

Answers

Answered by suresh6kp

3

Answer:

Given a=10,d=3,

S15 = n/2 [2a+(n-1)d]

= 15/2[2x10+(15-1 ) x3]

= 15/2[20+14x3]

= 15/2[20+42]

= 15/2[62]

= 15x31

= 465

Answered by usjadhav2001

0

Answer:

465

Step-by-step explanation:

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