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-81 is the ___term of the …

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-81 is the ___term of the AP : 21,18,15

Posted by Snehalata Behera 5 years ago

CBSE > Class 10 > Mathematics

4 answers

Sandeep A W 5 years ago

An=-81.

Sandeep A W 5 years ago

21,18,15...... a=21. d=a2-a1=18-21=-3. An=a+(n-1)d. -81=21+(n-1)(-3). -81=21-3n-3. -81=18-3n. -81-18=-3n. -99=-3n. n=-99/-3. n=33. -81 is 33rd term.

Loveneesh Kumar 5 years ago

a²-a¹=............ a³-a²=............ a⁴-a³=............ a=? And d=?

Aakib Khan 5 years ago

a=21, d=a2-a1 =18-21 =-3 an=-81 an=a+(n-1) d -81=21+(n-1) -3 -81=21-3n+3 -81=21+3-3n -81=24-3n -81-24=3n -105=3n -105/3=n -35=n

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