Math, asked by vijaywadhai31p76ec7, 11 months ago

if the nth term of a sequence is 3-2n .Find the sum of first 15 terms.

vijaywadhai31p76ec7: Someone please solve this

vijaywadhai31p76ec7: Its urgent

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Answered by shabanakhoyee

Answer:

Step-by-step explanation:

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vijaywadhai31p76ec7: Not at all helpful

vijaywadhai31p76ec7: You should answer it step by step

shabanakhoyee: I'm so sorry, I tried my best, it's my first time around

vijaywadhai31p76ec7: okay

shabanakhoyee: Hey, I'll answer this here itself for you, so we know
W

shabanakhoyee: an=a+(n-1)d. So we basically equate 3n-2 in such form, getting, 5+(n-1)d

shabanakhoyee: d is 2

shabanakhoyee: Now as we have the first term and the common difference, we equate it in the formula Sn=n/2[a+(n-1)d] where n= 15, you can see the rest in the picture itself

shabanakhoyee: Hope I could help:)

Answered by b22554113

Answer:

100% Correct Answer in the above Pic.

Step-by-step explanation:

See the answer And mark me as Brainliest

1 st one is wrong answer my answer is correct

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