math question 2 answer I need
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1(10term)
4(0)
5{3,7,10,17}
4(0)
5{3,7,10,17}
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Tn = 7 - 3n
=> a +(n-1)d = 4 + 3- 3n
=> a + (n-1)d = 4 - 3(n-1)
On comparing both sides, we get
a = 4
d = - 3
Now,
S25 = 25 /2 [ 2(4) + (25 - 1)(-3)]
= 25/2 [ 8 - 72]
= 25 × (-64) / 2
= 25 × (-32)
= - 800
=> a +(n-1)d = 4 + 3- 3n
=> a + (n-1)d = 4 - 3(n-1)
On comparing both sides, we get
a = 4
d = - 3
Now,
S25 = 25 /2 [ 2(4) + (25 - 1)(-3)]
= 25/2 [ 8 - 72]
= 25 × (-64) / 2
= 25 × (-32)
= - 800
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