the number of terms of AP 3,7,11,15, . . .. . to be taken so that the sum is 465 is a)8 b)10 c)14 d)15
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Step-by-step explanation:
14 i think so... .... ok
Answered by
1
Answer:
- Sn=n/2(2a+(n-1)d=92
Step-by-step explanation:
465=n/2(2(3)+(n+1)4)
465=n/2(6+4n+4)
465=n/2(10+4n)
465=5n+5
465-5=5n
460=5n
n=460/5
n=92
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