Math, asked by manogna22, 10 months ago

find sum of first 18 terms of the AP 9, 7, 5, 13

Answers

Answered by vaibhavlspise2001

1

Step-by-step explanation:

a= first term= 9

d=common difference = 7-9=-2

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

S18=9[18-34]

=9(-16)

=-144

thank you

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manogna22: thanks bhayya

manogna22: tune meri 2questions ka ans diya

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