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प्रश्न
Which term of following A.P. is −940.
50, 40, 30, 20 ........
Activity :- Here a = `square`, d = `square`, tn = −940
According to formula, tn = a + (n − 1)d
−940 = `square`
n = `square`
उत्तर
Here a = 50, d = 40 − 50 = −10, tn = −940
According to formula, tn = a + (n − 1)d
−940 = 50 + (n − 1)(−10)
∴ – 940 = 50 – 10n + 10
∴ – 940 = 60 – 10n
∴ 10n = 60 + 940
∴ 10n = 1000
∴ n = `1000/10`
n = 100
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