Question

If for an AP d=11 Then t17-t15=__????

Answer 1

Let the t1= a

According to the given condition,

t17-t15 = ?

= [a+(n-1)d] - [ a+(n -1 )d]

= (a+nd-d) - (a+ nd- d)

= a + nd - d - a - nd - d

= -d-d.........+ N - got cancelled

= -11-11

= - 22

t17-t15 = -22

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