find the sum first 51 terms of ap whose 2nd & 3rd term are 14 & -18 respectively
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Answered by
2
Answer:
2nd=a+d, a+2d
Step-by-step explanation:
sn=n/2 (2a+(n-1)d)
is the formula
Answered by
2
Answer:
-1770
Step-by-step explanation:
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