please solve fast
my dear lovely friend
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Answer:
a = 5 d = -3
an = a + ( n - 1 ) d
an = 5 + ( n - 1 ) -3
an = 5 + 3n - 3
an = 3n - 3 + 5
an = 3n + 2...........( equation 1 )
an = I
Sn = n ( a + I)
2
Sn = n ( 5 + 3n + 2 )
2
Sn = n ( 7 + 3n)
2
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